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A066990 as a simple table

na(n)
11
22
33
44
55
66
77
82
99
1010
1111
1212
1313
1414
1515
164
1717
1818
1919
2020
2121
2222
2323
246
2525
2626
273
2828
2929
3030
3131
322
3333
3434
3535
3636
3737
3838
3939
4010
4141
4242
4343
4444
4545
4646
4747
4812
4949
5050
5151
5252
5353
546
5555
5614
5757
5858
5959
6060
6161
6262
6363
644
6565
6666

[1,2,3,4,5,6,7,2,9,10,11,12,13,14,15,4,17,18,19,
 20,21,22,23,6,25,26,3,28,29,30,31,2,33,34,35,36,
 37,38,39,10,41,42,43,44,45,46,47,12,49,50,51,52,
 53,6,55,14,57,58,59,60,61,62,63,4,65,66]